The E48 DIN-Style Safety Key Interlock Limit
Switch is designed to be used with movable
guards or covers which must be closed for
operational safety. The key portion of the switch
is affixed to the movable door, cover or other
such guard. The switch itself is mounted to a
rigid portion of the machine. When the guard is
opened, the key is removed from the switch,
thereby positively breaking the normally closed
contacts. This interrupts the control circuit,
stopping machine operation.